By Melissa BaronIt's official, Christmas has hit San Francisco. There are still lots of things to do this weekend besides checking out holiday decorations downtown and downing peppermint bark sundaes. Here's the scoop:On Friday from 6-10 pm hang out in the Lower Haight for the Lower Haight Wonderland Walk. Doe has an art show and promises "loud beats and festive drinks." Other stores will stay open late inviting people in to eat, drink and well, purchase. There's a big all-ages show at Bottom of